Wrist protection and support mechanism

ABSTRACT

An article of manufacture for protecting a wrist of a person as the person operates equipment over a work surface. The article of manufacture includes a sheet and multiple protrusions attached to and extending from the sheet. The sheet may be placed on the work surface and the protrusions are adapted to provide support of the wrist. Two edges of the sheet may include fasteners allowing the article of manufacture to be worn as a band on the wrist. The sheet and protrusions may be manufactured in a single manufacturing process.

FIELD AND BACKGROUND

Carpal tunnel syndrome occurs when the median nerve, which runs from theforearm into the hand, becomes pressed or squeezed at the wrist. Themedian nerve controls sensations to the palm side of the thumb andfingers, as well as impulses to some small muscles in the hand thatallow the fingers and thumb to move. The carpal tunnel, a narrow, rigidpassageway of ligament and bones at the base of the hand houses themedian nerve and tendons. Sometimes, thickening from irritated tendonsor other swelling narrows the tunnel and causes the median nerve to becompressed. The result may be pain, weakness, or numbness in the handand wrist, radiating up the arm. At the workplace, workers can doon-the-job conditioning, perform stretching exercises, take frequentrest breaks, wear splints to keep wrists straight, and use correctposture and wrist position. Wearing fingerless gloves can help keephands warm and flexible. Workstations, tools and tool handles, and taskscan be redesigned to enable the worker's wrist to maintain a naturalposition during work. Employers can develop programs in ergonomics, theprocess of adapting workplace conditions and job demands to thecapabilities of workers.

Splints are safe and relatively inexpensive, and they give many peoplewith carpal tunnel syndrome and other orthopedic problems short-termrelief from their symptoms. Besides relieving discomfort, splints cansometimes improve conduction of nerve impulses along the median nerve,which can improve strength, dexterity and sensation. A number of designsfor wrist supports are disclosed in U.S. Pat. No. 6,694,519 (Stewart)“Device and method for supporting the wrist and hand of a computeruser”, U.S. Pat. No. 6,517,507 (Faherty) “Wrist guard for alleviatingrepetitive strain disorder by computer operators”, and US 2006/0226305(Sheybani) “Wristband for keyboards and mouse use”.

Rubber elasticity, also known as hyper elasticity, describes themechanical behavior of many polymers, especially those with crosslinking. Invoking the theory of rubber elasticity, one considers apolymer chain in a cross linked network as an entropic spring. When thechain is stretched, the entropy is reduced by a large margin becausethere are fewer conformations available. Therefore, there is a restoringforce, which causes the polymer chain to return to its equilibrium orunstretched state, such as a high entropy random coil configuration,once the external force is removed. This is the reason why rubber bandsreturn to their original state.

Silicone rubber is a polymer that has a “backbone” of silicon-oxygenlinkages, the same bond that is found in quartz, glass and sand.Normally, heat is required to set the silicone rubber. Silicone rubberarticles are typically injection molded.

BRIEF SUMMARY

According to the present invention there is provided an article ofmanufacture for protecting a wrist of a person as the person operatesequipment over a work surface. The article of manufacture includes asheet and multiple protrusions attached to and extending from the sheet.The sheet may be placed on the work surface and the protrusions arevertically oriented and adapted to provide support of the wrist. Thesheet and protrusions may be manufactured in a single manufacturingprocess, e.g casting or injection molding. Alternatively, the sheet mayand the protrusions may be of different materials typically with thesheet a stiffer material than that of the protrusions. The protrusionsmay have a lateral dimension, e.g. diameter of between 2 and 10millimeters. The protrusions typically have a number density on thesheet between half and ten per square centimeter. In use, theprotrusions provide support of the wrist. The sheet may include a woventextile matrix or a synthetic textile matrix. The protrusions may bemade from an elastic material, such as by polymerizing an elastomericresin. The protrusions may be made from selectably either siliconerubber, latex rubber or natural rubber or other elastomeric material.The sheet is optionally manufactured from a non-flexible material, anelastic material or a semi-rigid material. Two edges of the sheet mayinclude fasteners allowing the article of manufacture to be worn as aband on the wrist. When the article is used as a mat on the worksurface, the protrusions may be oriented upward toward the wrist ordownward toward the work surface. Optionally, the height of theprotrusions are graded along the length of the mat in order to providethe user with an adjustable height. Alternatively or in addition theheight of the protrusions varies along the width of the mat in order toconform to the angle of the wrist to the work surface.

According to the present invention there is provided an article ofmanufacture for protection a wrist of a person as the person operatesequipment over a work surface. The article of manufacture includes asheet with protrusions. The protrusions provide support of the wrist.The article of manufacture may function as either a mat for placement onthe work surface or as a wristband both for the protection of the wrist.The sheet and protrusions may be manufactured in a single casting suchas from a polymer resin which polymerizes into an elastic or resilientmaterial. A wristband closure, e.g. buckle or snap is typically attachedafter the casting.

According to the present invention there is provided a wristband ofsubstantially elliptical cross-section in the plane of the wristband.The wristband functions to support a wrist of a person as the personoperates equipment over a work surface. The wristband has multipleprotrusions extending either inward or outward from the band. The sheetand protrusions may be manufactured as a single casting. The protrusionstypically have a lateral dimension, e.g. diameter, of between two andten millimeters and a number density on said sheet between half and tenper square centimeter.

The foregoing and/or other aspects will become apparent from thefollowing detailed description when considered in conjunction with theaccompanying drawing figures.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is herein described, by way of example only, withreference to the accompanying drawings, wherein:

FIGS. 1A and 1B shows plan and cross sectional drawings respectively ofan article of manufacture for protection of a wrist, according to anembodiment of the present invention;

FIG. 1C is a cross sectional view of the article of manufacture forprotection of the wrist as a flat mat on a work surface, according to anembodiment of the present invention;

FIG. 2 is illustrates the article of manufacture of FIG. 1 being used asa wristband, according to an embodiment of the present invention;

FIG. 3 is a diagram showing the article of manufacture being used as aflat mat placed on the work surface with protrusions facing upward,according to an embodiment of the present invention;

FIG. 4 is an isometric drawing illustrating the article of manufactureas a wristband, according to an embodiment of the present invention;

FIG. 5 is an isometric drawing illustrating the article of manufactureas a wristband, according to another embodiment of the presentinvention;

FIG. 6 is an isometric drawing illustrating the article of manufactureas a wristband, according to yet another embodiment of the presentinvention;

FIG. 7 is still another isometric drawing illustrating the article ofmanufacture as a wristband, according to another embodiment of thepresent invention;

FIG. 8 is an isometric drawing illustrating the article of manufactureas a wristband, according to another embodiment of the presentinvention;

FIGS. 9-11 illustrate different examples of lateral distribution of theprotrusions which may be used in different embodiments of the presentinvention;

FIG. 12 illustrates varying heights of protrusions, according to anembodiment of the present invention;

FIG. 13 illustrates protrusions of two different heights and/or lateraldimension according to an embodiment of the present invention; and

FIGS. 14-19 illustrate different examples cross sections of theprotrusions, according to different embodiments of the presentinvention.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the presentinvention, examples of which are illustrated in the accompanyingdrawings; wherein like reference numerals refer to the like elementsthroughout. The embodiments are described below to explain the presentinvention by referring to the figures.

Referring now to the drawings, FIGS. 1A and 1B illustrate in plan (topview) and cross section of a single casting or other manufacture, e.g.injection molding of structure 7 of an elastic material, e.g. siliconerubber. Structure 7 to be used for protection of a wrist. The structurehas protrusions 1 attached to a sheet 5. Reference is now also made toFIG. 1C which illustrates sheet 5 is attached to a backing 3. Thematerial properties for the protrusions 1, sheet 5 and backing 3 areselected according to the requirements of the utilization of structure7.

Any casting method, e.g. injection molding, known in the art of polymerindustrial processes may be used to form structure 7.

Reference is now made to FIG. 2 which illustrates structure 7 in apreferred embodiment of the present invention being utilized as awristband 16. A hand 14 is shown using a computer mouse 12 on a worksurface 10. Backing 3 is preferably of canvas or similar textilematerial or another polymeric layer to provide comfort to the wearer ofwristband 16.

Reference is now also made to FIG. 3 which illustrates another preferredembodiment of the present invention in which structure 7 is utilized asa mat 18 with protrusions 1 facing upwards. Hand 14 is shown using mouse12 on work surface 10. Wrist/hand 14 is shown resting on protrusions 1,in this situation the dimensions and undeformed shape of protrusions 1are selected to provide comfort to the user of mat 18. Optionally, acoating is applied to the top surfaces of protrusions 1 to provideadditional comfort, i.e. the coating absorbs or dissipates sweat fromthe skin of the wrist. Backing 3 is optionally rubber to prevent theslipping of mat 18 or backing 3 is a canvas type of material whichallows the movement of mat 18. In other embodiments of the inventionwristband 16 is closed with protrusions 1 facing inward toward the wristinstead of outward.

FIGS. 4 and 5 show two different closure devices which form fasteners ofwristband 16, according to different embodiments of the presentinvention. FIG. 4 shows the ends of wristband 16 being connectedtogether by a clasp device, e.g. Velcro 20 a and 20 b. FIG. 5 shows theends of wristband 16 being connected together by a press stud 22 a and22 b.

Alternatively the ends of wristband 16 are connected together using anyother method known in the art of fastening.

Reference is now made to FIGS. 6-8 which illustrates further embodimentsof wristband 16, according to different aspects of the presentinvention. FIG. 6 illustrates an embodiment of wristband 16 in whichsheet 5 and optionally backing 3 are semi-rigid so that hand 14 may beinserted into the wristband while elastically deforming sheet 5 and thatafter inserting hand 14, wristband 16 elastically returns to itsundeformed state and closes around the wrist. The term “lateral” as usedherein in reference to wristband 16 refers to a direction which crossesthe width of the band in a direction parallel to the axis of rotationalsymmetry of the band. wristband 16 of FIG. 6 is cut substantially in thelateral direction so that while hand 14 is being inserted wristband 16deforms elastically by opening the lateral cut. The term “radial” asused herein in reference to wristband 16 refers to a directionperpendicular to the axis of rotational symmetry of the wristband. Theterm “circumferential” as used herein in reference to wristband 16refers to a direction perpendicular a radius of wristband 16 andtangential to wristband 16. The terms “outward” and “inward” refer todirections substantially perpendicular to a tangent to the circumferenceof the wristband. FIG. 7 illustrates an embodiment of wristband 16 inwhich sheet 5 and optionally backing 3 are typically more elastic (lessrigid) than that of FIG. 6. Closure of wristband 16 is achieved byincluding in edge contours 24 a and 24 b significant circumferentialportions. The circumferential portions of edge contours 24 a and 24 ballow a significant elastic distortion in the radial direction, i.e.opening the wristband, without having a large space in the band whichwould allow wristband 16 to fall sideways off the wrist. A similareffect is achieved if edge contours are straight but with a significantcircumferential component. FIG. 8 is an example of wristband 16 which isfully closed but is sufficiently elastic to allow deformation forinserting the hand through the band. In all embodiments, edge contours24 are either cut from a subsequent to injection molding or are moldedwith the edge contours during the molding process.

Reference is now made to FIG. 9-11 which illustrate exemplarydistributions in top view of protrusions 1 manufactured preferably in asingle casting on sheet 5, according to different aspects of the presentinvention. FIG. 9 illustrates protrusions distributed in an orderedlattice of rows and columns. Although the lattice constants (distancesbetween rows and columns) in both lateral directions are shown as equal,the present invention in other embodiments may be configured to havedistances between rows different from the distances between columns.Similarly, lattice angles may be configured to be angles other thanninety degrees as shown the example of FIG. 9. Reference is now made toFIGS. 10 and 11 which illustrate distributions of reduced order ofprotrusions 1 on sheet 5. In FIGS. 9 and 10 rows and columns are notnecessarily straight but follow a predictable or random curve. Theexample of FIG. 10 includes another aspect of borders which are notdefined, order does not increase at the borders. Other features notexplicitly illustrated may be used according to other features of thepresent invention. The cross sectional area of protrusions 1 may varyfrom row to row or column to column or even vary randomly throughout thedistribution. Lattice angles may also be varied within the distribution.

Reference is now made FIGS. 12 and 13 which illustrate another aspect ofthe present invention. Specifically, in FIG. 12, heights of protrusions1 vary monotonically along one or more lateral directions. The monotonicvariation may be suited to the angle of the wrist and/or contour of thewrist while wristband 16 and/or mat 18 is in use. FIG. 13 illustrates aperiodic size (height and lateral dimension variation) along one or morelateral directions. A periodic height variation is preferably combinedwith another periodically varying parameter such as a periodicallyvarying cross section of protrusion 1 along a lateral direction.

Reference is now made to FIGS. 14-19 which illustrate schematically infront view different example profiles of of protrusions 1. FIG. 14illustrates a profile 1A of a right angle prism or right circularcylinder with a flat top. FIG. 15 illustrates a a profile of a rightangle prism or right circular cylinder with a pointed top. FIG. 15illustrates a a profile 1B of a right angle prism or right circularcylinder with a pointed top. FIG. 15 illustrates a a profile 1C of aright angle prism or right circular cylinder with a rounded top. FIG. 16illustrates a a profile 1C of a right angle prism or right circularcylinder with a rounded top. FIG. 17 illustrates a profile 1D whichincludes a cone shaped bottom portion 1E. FIG. 18 illustrates a profile1F which in the bottom part is a right angled prism or cylinder 1G andin the top part not right angled, for instance portions of cones,paraboloids or ellipsoids. FIG. 19 illustrates a profile 1I which isellipsoid or paraboloid.

The present invention in different embodiments may be realized using anumber of elastomeric thermoset or thermoplastic polymers including:

-   -   Unsaturated rubbers that can be cured by sulfur vulcanization        such as Natural Rubber (NR), Synthetic Polyisobutylene (IR),        Butyl rubber (copolymer of isobutylene and isoprene, IIR),        Halogenated butyl rubbers (Chloro Butyl Rubber: CIIR; Bromo        Butyl Rubber: BIIR), Polybutadiene (BR), Styrene-butadiene        Rubber (copolymer of polystyrene and polybutadiene, SBR),        Nitrile Rubber (copolymer of polybutadiene and acrylonitrile,        NBR), also called Buna N rubbers, Hydrogenated Nitrile Rubbers        (HNBR) Therban and Zetpol, Chloroprene Rubber (CR),        polychloroprene, Neoprene, Baypren etc. Unsaturated rubbers can        also be cured by non-sulfur vulcanization if desired.    -   Saturated Rubbers that cannot be cured by sulfur vulcanization        include: EPM (ethylene propylene rubber, a copolymer of ethylene        and propylene) and EPDM rubber (ethylene propylene diene rubber,        a terpolymer of ethylene, propylene and a diene-component).        Epichlorohydrin rubber (ECO), Polyacrylic rubber (ACM, ABR),        Silicone rubber (SI, Q, VMQ), Fluorosilicone Rubber (FVMQ),        Fluoroelastomers (FKM, and FEPM) Viton, Tecnoflon, Fluorel,        Aflas and Dai-El, Perfluoroelastomers (FFKM) Tecnoflon PFR,        Kalrez, Chemraz, Perlast, Polyether Block Amides (PEBA)        Chlorosulfonated Polyethylene (CSM), (Hypalon), Ethylene-vinyl        acetate (EVA); and p1 Various other types of elastomers:        Thermoplastic elastomers (TPE), for example Elastron, etc.,        Thermoplastic Vulcanizates (TPV), for example Santoprene TPV,        Thermoplastic Polyurethane (TPU), Thermoplastic Olefins (TPO),        and the proteins resilin and elastin and Polysulfide Rubber

Preferred physical characteristics for the cast material are Shore Ahardness in the range 10-70

A casting was produced according to the embodiment of FIG. 1 using a twocomponent silicone elastomer S-471 (ESQUIM S.A., Barcelona, Spain) Theinventor who suffers from carpal tunnel syndrome tested the prototypeand found that the elastic protrusions alleviated discomfort.

While the invention has been described with respect to a limited numberof embodiments, it will be appreciated that many variations,modifications and other applications of the invention may be made.

1. An article of manufacture for protecting a wrist of a person as theperson operates equipment over a work surface, the article ofmanufacture comprising: a sheet and a plurality of protrusions attachedto and extending from said sheet.
 2. The article of manufactureaccording to claim 1, whereby said sheet is adapted for placement on thework surface said protrusions are vertically oriented adapted to providesupport of the wrist.
 3. The article of manufacture according to claim1, wherein said sheet and protrusions are manufactured in a singlecasting.
 4. The article of manufacture according to claim 1, whereinsaid protrusions have a lateral dimension of between 2 and 10millimeters.
 5. The article of manufacture according to claim 1, whereinsaid protrusions have a number density on said sheet between half andten per square centimeter.
 6. The article of manufacture according toclaim 1, wherein said sheet is of an elastic material.
 7. The article ofmanufacture according to claim 6, wherein said sheet includes a woventextile matrix.
 8. The article of manufacture according to claim 6,wherein said sheet includes a synthetic textile matrix.
 9. The articleof manufacture according to claim 1, wherein said protrusions are of anelastomer.
 10. The article of manufacture according to claim 1, whereinsaid protrusions are of selectably either silicone rubber, latex rubberor natural rubber.
 11. The article of manufacture according to claim 1wherein said sheet is a non-flexible material.
 12. The article ofmanufacture according to claim 1 wherein two edges of said sheet includefasteners to be worn as a band on the wrist.
 13. The article ofmanufacture according to claim 1, wherein said sheet is of a semi-rigidmaterial.
 14. The article of manufacture according to claim 1 whereinthe article is used as a mat on the work surface, wherein theprotrusions are selectably either oriented upward toward the wrist ordownward toward the work surface.
 15. A article of manufacture forprotection a wrist of a person as the person operates equipment over awork surface, the article of manufacture comprising: a sheet withprotrusions whereby said protrusions provide support of the wrist,wherein said sheet functions as selectably either a mat for placement onthe work surface or as a wristband both for the protection of the wrist.16. The article of manufacture according to claim 15, wherein said sheetand said protrusions are manufactured in a single casting.
 17. Awristband for supporting a wrist of a person as the person operatesequipment over a work surface, the wristband comprising: a wristband ofsubstantially elliptical cross-section in the plane of the wristband,said wristband having a plurality of protrusions extending selectablyeither outward or inward from said wristband.
 18. The wristbandaccording to claim 17, wherein said sheet is manufactured as a singlecasting.
 19. The wristband according to claim 17, wherein saidprotrusions have a lateral dimension of between 2 and 10 millimeters.20. The wristband according to claim 17, wherein said protrusions have anumber density on said sheet between half and ten per square centimeter.